Caution: In order to avoid deploying the air bag when troubleshooting the SIR system, use only the equipment specified in this manual and the instructions given in this manual. Failure to use the specified equipment as instructed could cause air bag deployment, personal injury to you or someone else, or unnecessary SIR system repairs.
Caution: If any water enters the vehicle's interior up to the level of the carpet or higher and soaks the carpet, the sensing and diagnostic module (SDM) and the SDM harness connector may need to be replaced. The SDM could be activated when powered, which could cause deployment of the air bag(s) and result in personal injury. Before attempting these procedures, the SIR system must be disabled. Refer to Disabling the SIR System.
With the ignition OFF, inspect the SDM mounting area, including the carpet. If any significant soaking or evidence of significant soaking is detected, you must perform the following tasks:These diagnostic procedures will help you to find and repair SIR system malfunctions. This service category also contains information for repairing SIR system malfunctions. For best results, use the diagnostic tables, and follow the sequence listed below:
• | Proper AIR BAG warning lamp operation |
• | Ability of the SDM to communicate through the data link connector (DLC) |
• | Existence of SIR Diagnostic Trouble Codes (DTC) |
• | Extended Diagnostic Time |
• | Incorrect Diagnosis |
• | Incorrect Parts Replacement |
The ignition switch supplies Ignition 1 voltage to the inflatable restraint sensing and diagnostic module (SDM) at terminal A1 using the SDM Fuse. When the ignition switch is first turned to the ON position, the SDM responds by performing tests on the SIR system and then commanding the AIR BAG warning lamp OFF after it has flashed seven times.
You must diagnose the diagnostic trouble codes in the order specified by the SIR Diagnostic System Check. Failure to do so may result in the following:
• | Extended Diagnostic Time |
• | Incorrect Diagnosis |
• | Incorrect Parts Replacement |
The numbers below refer to the step numbers on the diagnostic table.
This step checks to see if the AIR BAG warning lamp flashes seven times when the ignition key is turned to the ON position.
This step checks to see if the SIR warning lamp turns OFF after it had flashed seven times.
This step checks to see if the scan tool can communicate with the inflatable restraint sensing and diagnostic module (SDM).
This step checks to see if there are any current DTCs present.
This step checks to see if the scan tool can communicate with the inflatable restraint sensing and diagnostic module (SDM).
This step checks to see if there are any history DTCs present.
Step | Action | Value(s) | Yes | No | ||||
---|---|---|---|---|---|---|---|---|
Note the AIR BAG warning lamp while turning the ignition switch to the ON position. Does the AIR BAG warning lamp flash seven times? | -- | |||||||
Note the AIR BAG warning lamp after it had flashed seven times. Does the AIR BAG warning lamp go OFF? | -- | |||||||
Does the scan tool communicate with the SDM? | -- | Go to Scan Tool Does Not Communicate with Sensing and Diagnostic Module | ||||||
Use the scan tool to request the SIR Diagnostic Trouble Code (DTC) display for current DTCs. Is there a current DTC displayed? | -- | |||||||
5 |
Has the current DTC diagnosis been performed and the current DTCs cleared? | -- | -- | |||||
Does the scan tool communicate with the SDM? | -- | Go to Scan Tool Does Not Communicate with Sensing and Diagnostic Module | ||||||
Use the scan tool to request the SIR Diagnostic Trouble Code (DTC) display for history DTCs. Is there a history DTC displayed? | -- | System OK | ||||||
8 |
Has the diagnosis been performed and all of the DTCs cleared? | -- | -- |